CVE-2026-37552: Openmix Mix PHP

High severity, CVSS 8.4. EPSS: 0.5% chance of exploitation in the next 30 days.

Unsafe deserialization vulnerability in MixPHP Framework 2.x thru 2.2.17. The sync-invoke TCP server (Server.php:87) receives data from a TCP socket, passes it directly to Opis\Closure\unserialize(), then executes the result via call_user_func(). No authentication or signature verification exists on the TCP connection. An attacker with access to the localhost TCP port (server binds 127.0.0.1) can send a crafted serialized PHP closure to achieve arbitrary code execution.

Affected products

• Openmix Mix PHP: from 2.0.1, up to and including 2.2.17

Published 2026-05-01. Last modified 2026-07-08.